May weather forecastOlhão, Portugal
May
Weather in May
May brings the unmistakable signs of impending summer to Olhão. The month sees a dramatic reduction in rainfall, down to a mere 8mm (0.31") from 17mm (0.67") in April. Temperature swings become more substantial with a high of 21.3°C (70.3°F), indicating the arrival of hotter days. It's the ideal climate for indulging in water-based recreational activities such as swimming and paddleboarding. As daylight continues to stretch, opportunities to bask under the sun along the beautiful beaches of Olhão multiply.Temperature
May sees a marginal temperature increase, moving from a comfortable 18.3°C (64.9°F) in April to a pleasant 21.3°C (70.3°F). Olhão records a consistent low-temperature of 16.2°C (61.2°F) during May nights.Humidity
In Olhão, the average relative humidity in May is 69%.Rainfall
In Olhão, in May, during 4.3 rainfall days, 8mm (0.31") of precipitation is typically accumulated. Throughout the year, in Olhão, there are 54.1 rainfall days, and 109mm (4.29") of precipitation is accumulated.Sea temperature
In May, the average sea temperature in Olhão, Portugal, is 18.5°C (65.3°F).Note: For the majority, swimming in 18.5°C (65.3°F) does not offer a pleasant experience. Below 21°C (69.8°F), the difficulty in controlling breathing escalates.
Daylight
In May, the average length of the day is 14h and 10min.On the first day of May in Olhão, Portugal, sunrise is at 06:36 and sunset at 20:20. On the last day of the month, sunrise is at 06:13 and sunset at 20:45 WEST.
Sunshine
The average sunshine in May in Olhão is 11.2h.UV index
May through September, with an average maximum UV index of 6, are months with the highest UV index in Olhão. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the average person.Note: The UV index of 6 during May leads to these advisories:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Olhão, Portugal
- Average high temperature in May: 21.3°C
The warmest month (with the highest average high temperature) is August (27.1°C).
The month with the lowest average high temperature is January (15.1°C).
- Average low temperature in May: 16.2°C
The month with the highest average low temperature is August (20.8°C).
The coldest month (with the lowest average low temperature) is February (11.2°C).
Average pressure in May
Olhão, Portugal
- Average pressure in May: 1015.8mbar
The month with the highest atmospheric pressure is December (1022.5mbar).
The months with the lowest atmospheric pressure are April and August (1015.4mbar).
Average wind speed in May
Olhão, Portugal
- Average wind speed in May: 15.8km/h
The windiest months (with the highest average wind speed) are February and March (19km/h).
The calmest month (with the lowest average wind speed) is September (12.7km/h).
Average humidity in May
Olhão, Portugal
- Average humidity in May: 69%
The month with the highest relative humidity is April (74%).
The month with the lowest relative humidity is August (62%).
Average rainfall in May
Olhão, Portugal
- Average rainfall in May: 8mm
The wettest month (with the highest rainfall) is November (19mm).
The driest months (with the least rainfall) are June, July and August (1mm).
Average rainfall days in May
Olhão, Portugal
- Average rainfall days in May: 4.3 days
The month with the highest number of rainy days is April (8.2 days).
The month with the least rainy days is August (0.8 days).
Average sea temperature in May
Olhão, Portugal
- Average sea temperature in May: 18.5°C
The best month for swimming (with the highest average sea temperature) is August (22.1°C).
The coldest month (with the lowest average sea temperature) is March (15.9°C).
Average daylight in May /
Average sunshine in May
Olhão, Portugal
- Average daylight in May: 14h and 12min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in May: 11h and 12min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 6h and 6min).
Average sunshine days in May
Olhão, Portugal
- Average sunshine days in May: 25.3 days
The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is April (20.3 days).
Average UV index in May
Olhão, Portugal
- Average UV index in May: 6
The months with the highest UV index are May, June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in May
Olhão, Portugal
- Average cloud cover in May: 17
The month with the most cloud cover is January (Cloud cover 30).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in May
Olhão, Portugal
- Average visibility in May: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
